Subfeatures < 0.5% of continuum were detected moving through the line profiles of the Be/shell star γ Cas over a nine-month period in 1983. While the average spacing and acceleration of the subfeatures is consistent with nonradial pulsation of |m| = 12±4, large variations in the acceleration of the subfeatures are sometimes seen and some subfeatures appear and disappear suddenly. The observed period of the subfeature oscillations varies between 7000 and 10,000 seconds which is similar to the transient 6000-second variation in X-ray flux by EXOSAT in December 1984. No rapid E/C variation is observed in the Hγ and He I λ5876 emission-line profiles.
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Yang et al. (1988) studied this question.